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Finding the Fourth Proportional to 18,989.92, 26,199.12 and 11,913.76

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Solution

The fourth proportional to 18,989.92, 26,199.12 and 11,913.76 is: 16,436.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.92 : 26,199.12 = 11,913.76 : x
  2. Step 2: Convert to fraction form
    18,989.92/26,199.12 = 11,913.76/x
  3. Step 3: Cross multiply
    18,989.92x = 26,199.12 × 11,913.76
  4. Step 4: Simplify right side
    18,989.92x = 312,130,027.89
  5. Step 5: Solve for x
    x = 312,130,027.89/18,989.92
  6. Step 6: Final answer
    x = 16,436.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.